The invention relates to the field of printing equipment and discloses a screen printer base. The screen printer base comprises a rack and a base body, wherein a screen printing body is arranged above the base body; a barrel body is arranged on the base body; a floating plate is arranged in the barrel body in a sliding mode; a liquid cavity is formed between the floating plate and the base body; the floating plate is a hollow structure; the upper side of the floating plate is connected with a plurality of hollow tubes; the hollow tubes communicate with the hollow portion of the floating plate; the hollow structure of the floating plate further internally communicates with a gas extraction tube; the gas extraction tube is in sliding connection with the barrel body; one side of the base body is equipped with a piston barrel; a communication tube is in communication between the piston barrel and the liquid cavity; a piston plate is in sliding connection in the piston barrel; a piston rod is connected on a piston plate; one end, away from the piston plate, of the piston rod is connected with a connecting rod; one end, away from the piston rod, of the connecting rod is connected on the screen printing body; and a glass plate rotating mechanism is further arranged on the connecting rod. Compared with the prior art, the screen printer can protect a glass plate from being damaged during screen printing, and is safer to operate.